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Use of silicon-containing particles for protection of industrial materials from UV radiation

a technology of industrial materials and silicon, applied in the direction of silicon compounds, powder paints, coatings, etc., can solve the problems of limiting the lifetime, extremely troublesome, and particularly adverse effects of crystal contamination, and achieve excellent uv protection properties and high optical density

Inactive Publication Date: 2016-06-02
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a material that absorbs UV radiation and has a high optical density, making it easy to adjust the properties of electrooptical systems. The material can be used for protection of industrial materials, surfaces, components, and electrooptical layers or components from electromagnetic radiation. The invention also provides a method for preparing silicon-containing particles and a UV protection composition comprising silicon-containing particles. The amorphous silicon-containing particles have excellent UV protection properties and a high optical density.

Problems solved by technology

In the field of electrooptics and coatings, and here especially in the region of the UV spectral region, a particularly adverse effect is found to be associated with crystal contaminations having the property of having photocatalytic action, for example in the case of TiO2.
Photocatalytic effects of this kind, even in the lower % range, can be extremely troublesome in the coatings applications and greatly limit the lifetime thereof.
In addition, materials that are characterized by a high refractive index are of low availability and costly.

Method used

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  • Use of silicon-containing particles for protection of industrial materials from UV radiation
  • Use of silicon-containing particles for protection of industrial materials from UV radiation
  • Use of silicon-containing particles for protection of industrial materials from UV radiation

Examples

Experimental program
Comparison scheme
Effect test

working examples

[0138]FIG. 1a shows a TEM image of the inventive silicon-containing particles.

[0139]FIG. 1b shows the UV-vis spectra of the inventive product 6 (P6) as compared with a typical comparative product TiO2 type P25 (no. 5 in FIG. 1b) from Evonik. Table 1 below discloses, by way of example, the measured absorption (absorption: A, rel. unit) as a function of wavelength (λ [nm]) and as a function of the particle size of samples no. 1 to 5. The arrow points in the direction of increasing median particle size.

TABLE 1UV / vis to IR spectra (FIG. 1b):Spectrum sample no.14352[λ [nm]1.72.42.62.61.62002.711.41.072.32502.311.31.052.13002.711.251.052.13502.31.0310.91.54001.41.020.60.80.84500.750.970.40.720.555000.570.920.30.650.385500.50.880.240.60.266000.350.840.20.560.226500.30.80.160.530.187000.250.790.120.50.147500.220.760.10.480.128000.220.730.10.450.128500.210.670.090.420.119000.180.680.080.40.19500.160.660.060.390.110000.140.650.050.380.11050

[0140]The spectra 1, 2, 3, 4 and 5 of the samples sho...

working example 1

[0157]Obtaining amorphous silicon particles in high-purity form in a free-space reactor. Monosilane is decomposed in an H2 matrix (60% by volume). The hydrogen is used as heat transferer and as diluent gas. The residence time is from 100 to 500 milliseconds in a tubular reactor having a length of 50 cm.

[0158]The cooling and removal of the amorphous silicon is effected in a fluid. In the present case, the decomposition products were passed through liquid paraffin. The amorphous silicon primary particles formed can be stabilized in the paraffin and, according to the production conditions and concentration, are in the form of aggregated primary particles in clusters.

[0159]The particles have different primary particle sizes according to the specific process conditions. The process conditions were:

[0160](a) use of a gas mixture of[0161]2 standard liters (l (STP) / min) of argon, 1 l (STP) / min of argon with 5% by weight of SiH4 for production of samples 3a and 3b.[0162]For sample 3a a resid...

working examples 2a and 2b

Plasma

[0169](2a) Monosilane was converted in an argon plasma present in a non-thermal equilibrium. The resultant median primary particle size was 5 to 10 nm. The resultant reaction product was dispersed in dilute chloroform. A TEM image of this dispersion is shown in FIG. 8a.

[0170](2b) As experiment (2a), but with extended contact times. Median primary particle sizes of around 30 nm were obtained. The TEM image of the dispersion in dilute chloroform is shown in FIG. 8b.

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Abstract

Silicon-containing particles are used for protection of industrial materials, such as electrooptical layers or electrooptical components, from electromagnetic radiation in the UV range and optionally in the visible as far as the IR range, wherein the particles take the form of primary particles having a particle size in the range from 1 to 100 nm and may optionally take the form of clusters of the primary particles. A particular advantage is the possibility of matching the absorption of the electromagnetic radiation to the wavelength region to be absorbed that is of interest in a defined manner via the particle size and the particle size distribution. The silicon-containing particles can be used as biocompatible and biodegradable UV protection in industrial applications and compositions for industrial applications as formulations, such as preferably in coating compositions, such as paint.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to the use of silicon-containing particles for protection of industrial materials, such as electrooptical layers or electrooptical components, from electromagnetic radiation in the UV range and optionally in the visible as far as the IR range, where the particles take the form of primary particles having a particle size in the range from 1 to 100 nm and may optionally take the form of clusters of the primary particles. A particular advantage of the use according to the invention is the possibility of matching the absorption of the electromagnetic radiation to the wavelength region to be absorbed that is of interest in a defined manner via the particle size and the particle size distribution. The silicon-containing particles can be used as biocompatible and biodegradable UV protection in industrial applications and compositions for industrial applications as formulations, such as preferably in coati...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D5/03C08K3/34C08K3/36
CPCC09D5/03C08K3/34C08K3/36A61K8/25C01B33/029
Inventor LANG, JUERGEN ERWINKROELL, MICHAELUEHLENBRUCK, GOSWIN
Owner EVONIK DEGUSSA GMBH